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Development of athermal ε-martensite in atomized Co–Cr–Mo–C implant alloy powders

Paper ID Volume ID Publish Year Pages File Format Full-Text
2635 119 2006 7 PDF Available
Title
Development of athermal ε-martensite in atomized Co–Cr–Mo–C implant alloy powders
Abstract

Co–Cr–Mo atomized powders containing 0.05 wt.% C were sintered at temperatures above 900 °C for 1 h and then rapidly cooled to room temperature. As a result, various amounts of athermal ε-martensite were produced which increased with increasing sintering temperatures (from 30 vol.% at 950 °C to 70 vol.% at 1250 °C). Apparently, the development of ε-embryos was strongly promoted by increasing sintering temperatures due to the development of a high density of ε-nucleation site defects. In addition, athermal martensite readily formed in these powders, suggesting that its development was strongly favored by a significant reduction in the carbon supersaturation levels from 0.25 wt.% for most commercial alloys to 0.05 wt.% C. The amounts of ε-martensite were 3–4-fold those found in conventional alloys, suggesting that the powder structure provides increasing nucleation sites for athermal ε-martensite. Apparently free surfaces and grain development at powder contact surfaces combined with recrystallization and grain growth within powder particles lead to favorable dislocation configuration arrays for the development of ε-embryos.

Keywords
Co–Cr–Mo implant alloys; Atomized powders; Sintering; Athermal; ε-martensite
First Page Preview
Development of athermal ε-martensite in atomized Co–Cr–Mo–C implant alloy powders
Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 2, Issue 6, November 2006, Pages 685–691
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering